Gearing for transforming speed.



No. 642,594. Patented Feb. 6, I900. B. H. F. & A. H. FI NLAY.

GEARING FOR TRA NSFORMING SPEED.

(Application filed Dec. 9, 1897.)

(No Model.)

awuawtom "n-cz Norms PETERS co PrlOTc-LIYHO,W'KSHINGTON, n. c.

UNITED STATES ATENT Frrcn.

ROBERT HUGH FORSYTHE FINLAY AND ARCHlBALD HENRY FINLAY, OF BELFAST, IRELAND.

GEARING FOR TRANSFORMING SPEED.

SPEOIEFICATION forming part of Letters Patent No. 642,594, dated February 6, 1900.

Application filed December 9, 1897. Serial No. 661,293. (No model.)

To aZZ whom it may concern.-

Be it known that we, ROBERT HUGH FOR- SYTHE FINLAY, soap and candle manufacturer, and ARGHIBALD HENRY FINLAY, electrical engineer, of Victoria Square, in the city of Belfast, in the county of Antrim, Ireland, have invented certain new and useful Improvements in Gears for the Transformationof Speed; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawing, and to letters of reference marked thereon, which form a part of this specification.

Our invention relates to the transmission of power from one rotating shaft to another which it is desired to drive at a different speed in the same or the opposite direction.

To carry out our invention we employ systems of gearing substantially as described hereinafter and as illustrated in the accompanying drawing, in which the figure is a longitudinal section of a system of gearing for carrying our invention into eifect.

Referring to the drawing, a is the highspeed shaft carrying the pinions b b. Loosely mounted upon the shaft a, outside the pinions 19 and b, are two disks 9 g, in which are supported a plurality of shafts f, uniformly spaced apart. Upon each axle is mounted a series of gears d, e, c, and d, the gears 01 and cl meshing with the pinions b and 1), respectively. The gears d, e, c, and d on each shaft must be connected to move together, and this may be done by keying them to the shaft f and mounting the latter to turn in its hearings, or said gears-may be pinned or otherwise secured to each other and turn upon-the shaft. The slow-speed shaft is indicated by 7c, and a disk Z is rigidly connected to this shaft and carries an internally-toothed ring h, with which all the gears 01 mesh. Another disk Z is provided with a sleeve 7e, mounted to turn upon the shaft 70, and this disk carries an internallytoothed ring h, with which all the gears e mesh. Another disk Z is provided with a sleeve is, mounted to turn upon the sleeve and this disk carries an internally-toothed ring h, with which all the gears c mesh. To

the shaft lo and sleeves 7c and 7c", respectively, are secured the pulleys c', i, and t'.

It will be observed that the rings h, h, and h are of different diameters, the ring 72. being the smallest and the ring h the largest, and also that the gears (Z, e, and c are also of different diameters, 61 being the smallest and c the largest. The gears d and pinion b are provided to give steadiness and stability to the system of gearing.

Now if the shaft a is rotated the pinions b and b will rotate in the same direction; but the gears d, e, and 0 will rotate in the opposite direction, their axis being assumed to be stationary, and if the rings h, h, and h" are free to move they and the pulleys c', i, and i will all move in the same direction as the gears that is, in a direction opposite to that of the shaft-=but the speed of all the pulleys will be greatly reduced from the speed of the shaft, although not to an equal extent. The pulley 2' will run the slowest, pulley 2" next, and the pulley i" the fastest of the three.

If a brake a be tightened on the pulleyi sufficiently to hold it and the ring h against ro- 1 tation, then the gears 01 will travel around within the fixed ring h in the same direction as the shaft (1 moves and will impart the same movement to the gears e and c, disks g, and shafts f. The peripheries of gears e and c are, however, traveling faster than that of gear d, and consequently they will still exert pressure on their rings h and h to move them in a direction opposite the movement of the shaft, but at a speed much less than when all the rings are free to turn.

If a brake 2 be applied to pulley c", the pulley i and ring it will be caused to move in the same direction as the shaft, while pulley c' and ring h will still move in the opposite di-' rection, but at a still further reduced speed, and if a brake 2 be applied to the pulley 71 both the pulleys 2' and 2" will move in the same direction as the shaft a, but at different speeds.

We have illustrated three pulleys and three gear-rings meshing with three gears, the pulleys being arranged in close proximity on the same side of the machine. It is, however, obvious that the pulleys may be widely separated from each other by simply lengthening the sleeves, and also that one or more of the pulleys may be mounted on the opposite side of the machine and that the number of pulleys, gear-rings, and gears may be increased and still be within the scope of our thereon, of one or more shafts supported to revolve around the high-speed shaft, gears of different diameters carried by said revoluble shaft or shafts and movable together, internallytoothed rings of different diameters meshing with said gears, and one of said gears meshing with the pinion on the high-speed shaft, pulleys rigidly connected with the respective rings, and means for holding any one of the pulleys against rotation, substan tially as set forth.

In testimony whereof we affix our signatures in presence of two witnesses.

ROBERT HUGH FORSY'llIE FINLAY. ARCHIBALD HENRY FINLAY. \Vitnesses:

HUGH I'IYNDMAN, HUGH RoDDY. 

